<!DOCTYPE HTML>
<html lang="zh-CN">


<head>
    <meta charset="utf-8">
    <meta name="keywords" content="SpringCloud Alibaba Sentinel, Kevin&#39;s Blog">
    <meta name="description" content="">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta name="renderer" content="webkit|ie-stand|ie-comp">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <!-- Global site tag (gtag.js) - Google Analytics -->


    <title>SpringCloud Alibaba Sentinel | Kevin&#39;s Blog</title>
    <link rel="icon" type="image/png" href="/icon.png">

    <link rel="stylesheet" type="text/css" href="/libs/awesome/css/all.css">
    <link rel="stylesheet" type="text/css" href="/libs/materialize/materialize.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/aos/aos.css">
    <link rel="stylesheet" type="text/css" href="/libs/animate/animate.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/lightGallery/css/lightgallery.min.css">
    <link rel="stylesheet" type="text/css" href="/css/matery.css">
    <link rel="stylesheet" type="text/css" href="/css/my.css">

    <script src="/libs/jquery/jquery.min.js"></script>

<meta name="generator" content="Hexo 5.4.0"></head>




<body>
    <header class="navbar-fixed">
    <nav id="headNav" class="bg-color nav-transparent">
        <div id="navContainer" class="nav-wrapper container">
            <div class="brand-logo">
                <a href="/" class="waves-effect waves-light">
                    
                    <img src="/icon.png" class="logo-img" alt="LOGO">
                    
                    <span class="logo-span">Kevin&#39;s Blog</span>
                </a>
            </div>
            

<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fas fa-bars"></i></a>
<ul class="right nav-menu">
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/" class="waves-effect waves-light">
      
      <i class="fas fa-home" style="zoom: 0.6;"></i>
      
      <span>博客主页</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/archives" class="waves-effect waves-light">
      
      <i class="fas fa-archive" style="zoom: 0.6;"></i>
      
      <span>博客归档</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/about" class="waves-effect waves-light">
      
      <i class="fas fa-user-circle" style="zoom: 0.6;"></i>
      
      <span>关于Kevin</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/friends" class="waves-effect waves-light">
      
      <i class="fas fa-address-book" style="zoom: 0.6;"></i>
      
      <span>查看大佬</span>
    </a>
    
  </li>
  
  <li>
    <a href="#searchModal" class="modal-trigger waves-effect waves-light">
      <i id="searchIcon" class="fas fa-search" title="搜索" style="zoom: 0.85;"></i>
    </a>
  </li>
</ul>


<div id="mobile-nav" class="side-nav sidenav">

    <div class="mobile-head bg-color">
        
        <img src="/icon.png" class="logo-img circle responsive-img">
        
        <div class="logo-name">Kevin&#39;s Blog</div>
        <div class="logo-desc">
            
            Never really desperate, only the lost of the soul.
            
        </div>
    </div>

    

    <ul class="menu-list mobile-menu-list">
        
        <li class="m-nav-item">
	  
		<a href="/" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-home"></i>
			
			博客主页
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/archives" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-archive"></i>
			
			博客归档
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/about" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-user-circle"></i>
			
			关于Kevin
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/friends" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-address-book"></i>
			
			查看大佬
		</a>
          
        </li>
        
        
        <li><div class="divider"></div></li>
        <li>
            <a href="https://github.com/ZKQevin" class="waves-effect waves-light" target="_blank">
                <i class="fab fa-github-square fa-fw"></i>Fork Me
            </a>
        </li>
        
    </ul>
</div>


        </div>

        
            <style>
    .nav-transparent .github-corner {
        display: none !important;
    }

    .github-corner {
        position: absolute;
        z-index: 10;
        top: 0;
        right: 0;
        border: 0;
        transform: scale(1.1);
    }

    .github-corner svg {
        color: #0f9d58;
        fill: #fff;
        height: 64px;
        width: 64px;
    }

    .github-corner:hover .octo-arm {
        animation: a 0.56s ease-in-out;
    }

    .github-corner .octo-arm {
        animation: none;
    }

    @keyframes a {
        0%,
        to {
            transform: rotate(0);
        }
        20%,
        60% {
            transform: rotate(-25deg);
        }
        40%,
        80% {
            transform: rotate(10deg);
        }
    }
</style>

<a href="https://github.com/ZKQevin" class="github-corner tooltipped hide-on-med-and-down" target="_blank"
   data-tooltip="Fork Me" data-position="left" data-delay="50">
    <svg viewBox="0 0 250 250" aria-hidden="true">
        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
        <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
              fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
        <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
              fill="currentColor" class="octo-body"></path>
    </svg>
</a>
        
    </nav>

</header>

    



<div class="bg-cover pd-header post-cover" style="background-image: url('/medias/featureimages/0.jpg')">
    <div class="container" style="right: 0px;left: 0px;">
        <div class="row">
            <div class="col s12 m12 l12">
                <div class="brand">
                    <h1 class="description center-align post-title">SpringCloud Alibaba Sentinel</h1>
                </div>
            </div>
        </div>
    </div>
</div>




<main class="post-container content">

    
    <link rel="stylesheet" href="/libs/tocbot/tocbot.css">
<style>
    #articleContent h1::before,
    #articleContent h2::before,
    #articleContent h3::before,
    #articleContent h4::before,
    #articleContent h5::before,
    #articleContent h6::before {
        display: block;
        content: " ";
        height: 100px;
        margin-top: -100px;
        visibility: hidden;
    }

    #articleContent :focus {
        outline: none;
    }

    .toc-fixed {
        position: fixed;
        top: 64px;
    }

    .toc-widget {
        width: 345px;
        padding-left: 20px;
    }

    .toc-widget .toc-title {
        padding: 35px 0 15px 17px;
        font-size: 1.5rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    .toc-widget ol {
        padding: 0;
        list-style: none;
    }

    #toc-content {
        padding-bottom: 30px;
        overflow: auto;
    }

    #toc-content ol {
        padding-left: 10px;
    }

    #toc-content ol li {
        padding-left: 10px;
    }

    #toc-content .toc-link:hover {
        color: #42b983;
        font-weight: 700;
        text-decoration: underline;
    }

    #toc-content .toc-link::before {
        background-color: transparent;
        max-height: 25px;

        position: absolute;
        right: 23.5vw;
        display: block;
    }

    #toc-content .is-active-link {
        color: #42b983;
    }

    #floating-toc-btn {
        position: fixed;
        right: 15px;
        bottom: 76px;
        padding-top: 15px;
        margin-bottom: 0;
        z-index: 998;
    }

    #floating-toc-btn .btn-floating {
        width: 48px;
        height: 48px;
    }

    #floating-toc-btn .btn-floating i {
        line-height: 48px;
        font-size: 1.4rem;
    }
</style>
<div class="row">
    <div id="main-content" class="col s12 m12 l9">
        <!-- 文章内容详情 -->
<div id="artDetail">
    <div class="card">
        <div class="card-content article-info">
            <div class="row tag-cate">
                <div class="col s7">
                    
                          <div class="article-tag">
                            <span class="chip bg-color">无标签</span>
                          </div>
                    
                </div>
                <div class="col s5 right-align">
                    
                </div>
            </div>

            <div class="post-info">
                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2021-04-30
                </div>
                

                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-check fa-fw"></i>更新日期:&nbsp;&nbsp;
                    2021-04-30
                </div>
                

                

                

                
            </div>
        </div>
        <hr class="clearfix">

        

        

        <div class="card-content article-card-content">
            <div id="articleContent">
                <h1 id="1、Sentinel概述"><a href="#1、Sentinel概述" class="headerlink" title="1、Sentinel概述"></a>1、Sentinel概述</h1><h2 id="1-1、Sentinel是什么"><a href="#1-1、Sentinel是什么" class="headerlink" title="1.1、Sentinel是什么"></a>1.1、Sentinel是什么</h2><p>轻量级的流量控制、熔断降级Java库，就类似于Hystrix框架，是Alibaba的。<br>GitHub地址：<a target="_blank" rel="noopener" href="https://github.com/alibaba/Sentinel">https://github.com/alibaba/Sentinel</a><br>下载地址：<a target="_blank" rel="noopener" href="https://github.com/alibaba/Sentinel/releases">https://github.com/alibaba/Sentinel/releases</a><br>中文文档地址：<a target="_blank" rel="noopener" href="https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D">https://github.com/alibaba/Sentinel/wiki</a><br>英文文档地址：<a target="_blank" rel="noopener" href="https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel">https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel</a></p>
<h2 id="1-2、Sentinel能做什么"><a href="#1-2、Sentinel能做什么" class="headerlink" title="1.2、Sentinel能做什么"></a>1.2、Sentinel能做什么</h2><p><img src="https://img-blog.csdnimg.cn/20210420144157203.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="特性"></p>
<h2 id="1-3、Sentinel安装过程"><a href="#1-3、Sentinel安装过程" class="headerlink" title="1.3、Sentinel安装过程"></a>1.3、Sentinel安装过程</h2><p><img src="https://img-blog.csdnimg.cn/20210420144310662.png" alt="安装部分"><br>下载Jar包到本地，前提保证有JDK1.8环境以及8080端口未被占用，运行java -jar sentinel-dashboard-(版本号).jar。之后访问：<a target="_blank" rel="noopener" href="http://localhost:8080/">http://localhost:8080</a>即可访问到控制台。</p>
<h2 id="1-4、初始化演示工程"><a href="#1-4、初始化演示工程" class="headerlink" title="1.4、初始化演示工程"></a>1.4、初始化演示工程</h2><p>1.添加依赖（必须保证Nacos和Sentinel同时存在依赖环境）</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;!--SpringCloud ailibaba nacos --&gt;</span><br><span class="line">      &lt;dependency&gt;</span><br><span class="line">          &lt;groupId&gt;com.alibaba.cloud&lt;&#x2F;groupId&gt;</span><br><span class="line">          &lt;artifactId&gt;spring-cloud-starter-alibaba-nacos-discovery&lt;&#x2F;artifactId&gt;</span><br><span class="line">      &lt;&#x2F;dependency&gt;</span><br><span class="line">      &lt;!--SpringCloud ailibaba sentinel --&gt;</span><br><span class="line">      &lt;dependency&gt;</span><br><span class="line">          &lt;groupId&gt;com.alibaba.cloud&lt;&#x2F;groupId&gt;</span><br><span class="line">          &lt;artifactId&gt;spring-cloud-starter-alibaba-sentinel&lt;&#x2F;artifactId&gt;</span><br><span class="line">      &lt;&#x2F;dependency&gt;</span><br></pre></td></tr></table></figure>
<p>2.修改Yaml配置文件将服务注册进入Nacos并配置Sentinel控制台和暴露监控点</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">server:</span><br><span class="line">  port: 8401</span><br><span class="line">spring:</span><br><span class="line">  application:</span><br><span class="line">    name: cloudalibaba-sentinel-service</span><br><span class="line">  cloud:</span><br><span class="line">    nacos:</span><br><span class="line">      discovery:</span><br><span class="line">        #Nacos服务注册中心地址</span><br><span class="line">        server-addr: localhost:8848</span><br><span class="line">    sentinel:</span><br><span class="line">      transport:</span><br><span class="line">        #配置Sentinel dashboard地址</span><br><span class="line">        dashboard: localhost:8080</span><br><span class="line">        #默认8719端口，假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口</span><br><span class="line">        port: 8719</span><br><span class="line"></span><br><span class="line">management:</span><br><span class="line">  endpoints:</span><br><span class="line">    web:</span><br><span class="line">      exposure:</span><br><span class="line">        include: &#39;*&#39;</span><br></pre></td></tr></table></figure>
<p>3.主启动类</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@EnableDiscoveryClient</span><br><span class="line">@SpringBootApplication</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">MainApp8401</span> </span>&#123;</span><br><span class="line">    public <span class="keyword">static</span> <span class="keyword">void</span> <span class="function"><span class="title">main</span>(<span class="params"><span class="built_in">String</span>[] args</span>)</span> &#123;</span><br><span class="line">        SpringApplication.run(MainApp8401.class, args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>4.业务类Controller</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">@RestController</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">FlowLimitController</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    @GetMapping(<span class="string">&quot;/testA&quot;</span>)</span><br><span class="line">    public <span class="built_in">String</span> testA()</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;================测试A已经成功通过================&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @GetMapping(<span class="string">&quot;/testB&quot;</span>)</span><br><span class="line">    public <span class="built_in">String</span> testB()</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;================测试B已经成功通过================&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>5.测试<br>先启动Nacos再启动Sentinel，登录Sentinel发现什么都没有，需要<strong>事先访问资源端点</strong>才能在控制台看到资源目录。所以得到结论：sentinel8080正在监控微服务8401</p>
<h1 id="2、Sentinel流控规则"><a href="#2、Sentinel流控规则" class="headerlink" title="2、Sentinel流控规则"></a>2、Sentinel流控规则</h1><h2 id="2-1、流控规则基本术语介绍"><a href="#2-1、流控规则基本术语介绍" class="headerlink" title="2.1、流控规则基本术语介绍"></a>2.1、流控规则基本术语介绍</h2><p><img src="https://img-blog.csdnimg.cn/20210420145248483.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="介绍"></p>
<h2 id="2-2、流控模式"><a href="#2-2、流控模式" class="headerlink" title="2.2、流控模式"></a>2.2、流控模式</h2><h3 id="2-2-1、直接"><a href="#2-2-1、直接" class="headerlink" title="2.2.1、直接"></a>2.2.1、直接</h3><p><img src="https://img-blog.csdnimg.cn/20210420145538204.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<p>默认的流控规则，配置一秒钟最大允许一次通过，表示1秒钟内查询1次就是OK，若超过次数1，就直接-快速失败，报默认错误。<br>快速点击访问<a target="_blank" rel="noopener" href="http://localhost:8401/testA%EF%BC%8C**%E4%BC%9A%E6%8A%A5Blocked">http://localhost:8401/testA，**会报Blocked</a> by Sentinel (flow limiting)这个默认错误**。</p>
<h3 id="2-2-2、关联"><a href="#2-2-2、关联" class="headerlink" title="2.2.2、关联"></a>2.2.2、关联</h3><p><img src="https://img-blog.csdnimg.cn/20210420145654755.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<p>当关联的资源达到阈值时，就限流自己，当关联资源/testB的qps阀值超过1时，就限流/testA的Rest访问地址，当关联资源到阈值后限制配置好的资源名。<br>使用PostMan进行线程组访问testB节点，再访问testA资源发现A资源已经被限制访问。</p>
<h3 id="2-2-3、链路"><a href="#2-2-3、链路" class="headerlink" title="2.2.3、链路"></a>2.2.3、链路</h3><p>使用多个请求去调用同一个微服务，所以会出现链路失败的情况。</p>
<h2 id="2-3、流控效果"><a href="#2-3、流控效果" class="headerlink" title="2.3、流控效果"></a>2.3、流控效果</h2><h3 id="2-3-1、直接-gt-快速失败"><a href="#2-3-1、直接-gt-快速失败" class="headerlink" title="2.3.1、直接-&gt;快速失败"></a>2.3.1、直接-&gt;快速失败</h3><p>默认的流控处理效果，出现<strong>Blocked by Sentinel (flow limiting)</strong> 异常，源码位于DefaultController这个控制层中可以发现里面有这条语句。</p>
<h3 id="2-3-2、预热"><a href="#2-3-2、预热" class="headerlink" title="2.3.2、预热"></a>2.3.2、预热</h3><p><img src="https://img-blog.csdnimg.cn/20210420150242835.png" alt="配置"></p>
<p>公式：阈值除以coldFactor(默认值为3),经过预热时长后才会达到阈值。默认coldFactor为3，即请求 QPS 从 threshold / 3 开始，经预热时长逐渐升至设定的 QPS 阈值。<br>源码：WarmUpController类中。<br>应用场景：秒杀系统在开启的瞬间，会有很多流量上来，预热方式就是为了保护系统，以慢慢增大吞吐量。</p>
<h3 id="2-3-3、排队等待"><a href="#2-3-3、排队等待" class="headerlink" title="2.3.3、排队等待"></a>2.3.3、排队等待</h3><p><img src="https://img-blog.csdnimg.cn/20210420150421797.png" alt="在这里插入图片描述"></p>
<p>匀速排队，阈值必须设置为QPS。<br><img src="https://img-blog.csdnimg.cn/20210420150353239.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"><br>源码在：com.alibaba.csp.sentinel.slots.block.flow.controller.RateLimiterController</p>
<h1 id="3、Sentinel降级规则"><a href="#3、Sentinel降级规则" class="headerlink" title="3、Sentinel降级规则"></a>3、Sentinel降级规则</h1><h2 id="3-1、基本介绍"><a href="#3-1、基本介绍" class="headerlink" title="3.1、基本介绍"></a>3.1、基本介绍</h2><p>Sentinel 熔断降级会在调用链路中某个资源出现不稳定状态时（例如调用超时或异常比例升高），对这个资源的调用进行限制，<br>让请求快速失败，避免影响到其它的资源而导致级联错误。</p>
<p>当资源被降级后，在接下来的降级时间窗口之内，对该资源的调用都自动熔断（默认行为是抛出 DegradeException）。<br>Sentinel的断路器是<strong>没有半开状态</strong>的，不像Hystrix是有半开状态。<br><img src="https://img-blog.csdnimg.cn/20210420150744245.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<h2 id="3-2、降级策略-RT"><a href="#3-2、降级策略-RT" class="headerlink" title="3.2、降级策略-RT"></a>3.2、降级策略-RT</h2><p><img src="https://img-blog.csdnimg.cn/20210420150845450.png" alt="在这里插入图片描述"><br>Java代码</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/testD&quot;</span>)</span><br><span class="line">public <span class="built_in">String</span> testD()</span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">//暂停几秒钟线程</span></span><br><span class="line">    <span class="keyword">try</span> &#123; TimeUnit.SECONDS.sleep(<span class="number">1</span>); &#125; <span class="keyword">catch</span> (InterruptedException e) &#123; e.printStackTrace(); &#125;</span><br><span class="line">    log.info(<span class="string">&quot;testD 测试RT&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="string">&quot;------testD&quot;</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>配置<br><img src="https://img-blog.csdnimg.cn/20210420150937180.png" alt="在这里插入图片描述"><br>永远一秒钟打进来10个线程（大于5个了）调用testD，我们希望200毫秒处理完本次任务，<br>如果超过200毫秒还没处理完，在未来1秒钟的时间窗口内，断路器打开(保险丝跳闸)微服务不可用，保险丝跳闸断电了。</p>
<h2 id="3-3、降级策略-异常比例"><a href="#3-3、降级策略-异常比例" class="headerlink" title="3.3、降级策略-异常比例"></a>3.3、降级策略-异常比例</h2><p><img src="https://img-blog.csdnimg.cn/20210420151057235.png" alt="在这里插入图片描述"><br>Java代码</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/testD&quot;</span>)</span><br><span class="line">public <span class="built_in">String</span> testD()</span><br><span class="line">&#123;</span><br><span class="line">    log.info(<span class="string">&quot;testD 测试RT&quot;</span>);</span><br><span class="line">    int age = <span class="number">10</span>/<span class="number">0</span>;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">&quot;------testD&quot;</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>配置<br><img src="https://img-blog.csdnimg.cn/20210420151137928.png" alt="在这里插入图片描述"><br>如果异常超过百分之二十就断开断路器<br>单独访问一次，必然来一次报错一次(int age  = 10/0)，调一次错一次；开启jmeter后，直接高并发发送请求，多次调用达到我们的配置条件了。断路器开启(保险丝跳闸)，微服务不可用了，不再报错<strong>error（页面）</strong>而是服务降级了。</p>
<h2 id="3-4、降级策略-异常数"><a href="#3-4、降级策略-异常数" class="headerlink" title="3.4、降级策略-异常数"></a>3.4、降级策略-异常数</h2><p><img src="https://img-blog.csdnimg.cn/20210420151239463.png" alt="在这里插入图片描述"><br>Java代码</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/testE&quot;</span>)</span><br><span class="line">public <span class="built_in">String</span> testE()</span><br><span class="line">&#123;</span><br><span class="line">    log.info(<span class="string">&quot;testE 测试异常比例&quot;</span>);</span><br><span class="line">    int age = <span class="number">10</span>/<span class="number">0</span>;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">&quot;------testE 测试异常比例&quot;</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>配置<br><img src="https://img-blog.csdnimg.cn/20210420151306642.png" alt="在这里插入图片描述"><br><a target="_blank" rel="noopener" href="http://localhost:8401/testE%EF%BC%8C%E7%AC%AC%E4%B8%80%E6%AC%A1%E8%AE%BF%E9%97%AE%E7%BB%9D%E5%AF%B9%E6%8A%A5%E9%94%99%EF%BC%8C%E5%9B%A0%E4%B8%BA%E9%99%A4%E6%95%B0%E4%B8%8D%E8%83%BD%E4%B8%BA%E9%9B%B6%EF%BC%8C">http://localhost:8401/testE，第一次访问绝对报错，因为除数不能为零，</a><br>我们看到error窗口，但是达到5次报错后，进入熔断后降级。就不会报错误页面而是报服务降级的页面。</p>
<h1 id="4、Sentinel热点key限流"><a href="#4、Sentinel热点key限流" class="headerlink" title="4、Sentinel热点key限流"></a>4、Sentinel热点key限流</h1><h2 id="4-1、热点key限流基本配置"><a href="#4-1、热点key限流基本配置" class="headerlink" title="4.1、热点key限流基本配置"></a>4.1、热点key限流基本配置</h2><p>何为热点<br>热点即经常访问的数据，很多时候我们希望统计或者限制某个热点数据中访问频次最高的TopN数据，并对其访问进行限流或者其它操作。</p>
<p>我们能不能自定?类似hystrix，某个方法出问题了，就找对应的兜底降级方法？<br>使用@SentinelResource可以实现，类似于Hystrix的自定义降级方法。</p>
<p><strong>Java代码配置自定义降级方法显示</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/testHotKey&quot;</span>)</span><br><span class="line">    @SentinelResource(value = <span class="string">&quot;testHotKey&quot;</span>, blockHandler = <span class="string">&quot;defaultHandler_testHotKey&quot;</span>)</span><br><span class="line">    public <span class="built_in">String</span> testHotKey(@RequestParam(value = <span class="string">&quot;p1&quot;</span>, required = <span class="literal">false</span>) <span class="built_in">String</span> p1,</span><br><span class="line">                             @RequestParam(value = <span class="string">&quot;p2&quot;</span>, required = <span class="literal">false</span>) <span class="built_in">String</span> p2) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;==============testHotKey&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    public <span class="built_in">String</span> <span class="function"><span class="title">defaultHandler_testHotKey</span>(<span class="params"><span class="built_in">String</span> p1, <span class="built_in">String</span> p2, BlockException ble</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;==============defaultHandler_testHotKey，┭┮﹏┭┮&quot;</span>;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>此时我们对第一个参数也就是p1进行限流，如果有它参与的请求那么久限制他的访问<br><img src="https://img-blog.csdnimg.cn/20210420151942837.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<h2 id="4-2、热点key参数例外项配置"><a href="#4-2、热点key参数例外项配置" class="headerlink" title="4.2、热点key参数例外项配置"></a>4.2、热点key参数例外项配置</h2><p>我们期望p1参数当它是某个特殊值时，它的限流值和平时不一样，加入我们想要p1=3的时候，让他能够有更多的阈值。<br>在高级选项中打开这个并设置参数类型String，设置参数值为3，限定阈值为500。<br>这样传过来的参数p1只要等于3的时候就拥有500的上限。</p>
<h1 id="5、-SentinelResource注解详解"><a href="#5、-SentinelResource注解详解" class="headerlink" title="5、@SentinelResource注解详解"></a>5、@SentinelResource注解详解</h1><h2 id="5-1、基本限流配置存在的问题"><a href="#5-1、基本限流配置存在的问题" class="headerlink" title="5.1、基本限流配置存在的问题"></a>5.1、基本限流配置存在的问题</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/byResource&quot;</span>)</span><br><span class="line">    @SentinelResource(value = <span class="string">&quot;byResource&quot;</span>, blockHandler = <span class="string">&quot;handleException&quot;</span>)</span><br><span class="line">    public CommonResult <span class="function"><span class="title">byResource</span>(<span class="params"></span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult(<span class="number">200</span>, <span class="string">&quot;按资源名称限流测试OK&quot;</span>, <span class="keyword">new</span> Payment(2020L, <span class="string">&quot;serial001&quot;</span>));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    public CommonResult <span class="function"><span class="title">handleException</span>(<span class="params">BlockException exception</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult(<span class="number">444</span>, exception.getClass().getCanonicalName() + <span class="string">&quot;\t 服务不可用&quot;</span>);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>这样限流之后，如果出现状况不会出现默认的页面会出现handleException中的结果。<br><strong>以上代码出现的问题</strong><br>1、依照现有条件，我们自定义的处理方法又和业务代码耦合在一块，不直观。<br>2、每个业务方法都添加一个兜底的，那代码膨胀加剧。<br>3、全局统一的处理方法没有体现。</p>
<h2 id="5-2、全局限流配置"><a href="#5-2、全局限流配置" class="headerlink" title="5.2、全局限流配置"></a>5.2、全局限流配置</h2><p>编写一个类</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">CustomerBlockHandler</span> </span>&#123;</span><br><span class="line">    public <span class="keyword">static</span> CommonResult <span class="function"><span class="title">handleException01</span>(<span class="params">BlockException exception</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult(<span class="number">4444</span>, <span class="string">&quot;自定义的限流处理信息，handleException01&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    public <span class="keyword">static</span> CommonResult <span class="function"><span class="title">handleException02</span>(<span class="params">BlockException exception</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult(<span class="number">4444</span>, <span class="string">&quot;自定义的限流处理信息，handleException02&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>主要在@SentinelResource中添加参数blockHandlerClass即可</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">@GetMapping(<span class="string">&quot;/rateLimit/customerBlockHandler&quot;</span>)</span><br><span class="line">    @SentinelResource(value = <span class="string">&quot;customerBlockHandler&quot;</span>,</span><br><span class="line">            blockHandlerClass = CustomerBlockHandler.class, blockHandler = <span class="string">&quot;handleException02&quot;</span>)</span><br><span class="line">    public CommonResult <span class="function"><span class="title">customerBlockHandler</span>(<span class="params"></span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult(<span class="number">200</span>, <span class="string">&quot;按客户自定义限流处理逻辑&quot;</span>);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>这样就可以指定是CustomerBlockHandler中的handleException02方法来处理被限流之后所出现的页面，避免代码耦合，解决全局统一与自定义。</p>
<h1 id="6、Sentinel服务熔断功能"><a href="#6、Sentinel服务熔断功能" class="headerlink" title="6、Sentinel服务熔断功能"></a>6、Sentinel服务熔断功能</h1><h2 id="6-1、Ribbon系列"><a href="#6-1、Ribbon系列" class="headerlink" title="6.1、Ribbon系列"></a>6.1、Ribbon系列</h2><p>1、创建服务提供者9003/9004，过程省略。<br>2、创建服务消费者84<br>①、Pom依赖文件</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;!--SpringCloud ailibaba nacos --&gt;</span><br><span class="line">        &lt;dependency&gt;</span><br><span class="line">            &lt;groupId&gt;com.alibaba.cloud&lt;&#x2F;groupId&gt;</span><br><span class="line">            &lt;artifactId&gt;spring-cloud-starter-alibaba-nacos-discovery&lt;&#x2F;artifactId&gt;</span><br><span class="line">        &lt;&#x2F;dependency&gt;</span><br><span class="line">        &lt;!--SpringCloud ailibaba sentinel --&gt;</span><br><span class="line">        &lt;dependency&gt;</span><br><span class="line">            &lt;groupId&gt;com.alibaba.cloud&lt;&#x2F;groupId&gt;</span><br><span class="line">            &lt;artifactId&gt;spring-cloud-starter-alibaba-sentinel&lt;&#x2F;artifactId&gt;</span><br><span class="line">        &lt;&#x2F;dependency&gt;</span><br></pre></td></tr></table></figure>
<p>②、Yaml配置文件与之前的差不多不赘述<br>主要注册进入Nacos以及Sentinel中。<br>③、配置Ribbon的RestTemplate类</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">@Configuration</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">ApplicationContextConfig</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    @Bean</span><br><span class="line">    @LoadBalanced</span><br><span class="line">    public RestTemplate getRestTemplate()</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> RestTemplate();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>④、Controller控制层</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line">@RestController</span><br><span class="line">@Slf4j</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">CircleBreakerController</span> </span>&#123;</span><br><span class="line">    public <span class="keyword">static</span> final <span class="built_in">String</span> SERVICE_URL = <span class="string">&quot;http://nacos-payment-provider&quot;</span>;</span><br><span class="line"></span><br><span class="line">    @Resource</span><br><span class="line">    private RestTemplate restTemplate;</span><br><span class="line">    @RequestMapping(<span class="string">&quot;/consumer/fallback/&#123;id&#125;&quot;</span>)</span><br><span class="line">    @SentinelResource(value = <span class="string">&quot;fallback&quot;</span>, fallback = <span class="string">&quot;handlerFallback&quot;</span>, blockHandler = <span class="string">&quot;blockHandler&quot;</span>)</span><br><span class="line">    public CommonResult&lt;Payment&gt; <span class="function"><span class="title">fallback</span>(<span class="params">@PathVariable Long id</span>)</span> &#123;</span><br><span class="line">        CommonResult&lt;Payment&gt; result = restTemplate.getForObject(SERVICE_URL + <span class="string">&quot;/paymentSQL/&quot;</span> + id, CommonResult.class, id);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (id == <span class="number">4</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">&quot;IllegalArgumentException,非法参数异常....&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (result.getData() == <span class="literal">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> NullPointerException(<span class="string">&quot;NullPointerException,该ID没有对应记录,空指针异常&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> result;</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    public CommonResult <span class="function"><span class="title">handlerFallback</span>(<span class="params">@PathVariable Long id, Throwable e</span>)</span> &#123;</span><br><span class="line">        Payment payment = <span class="keyword">new</span> Payment(id, <span class="string">&quot;null&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult&lt;&gt;(<span class="number">444</span>, <span class="string">&quot;兜底异常handlerFallback,exception内容  &quot;</span> + e.getMessage(), payment);</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    public CommonResult <span class="function"><span class="title">blockHandler</span>(<span class="params">@PathVariable Long id, BlockException blockException</span>)</span> &#123;</span><br><span class="line">        Payment payment = <span class="keyword">new</span> Payment(id, <span class="string">&quot;null&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult&lt;&gt;(<span class="number">445</span>, <span class="string">&quot;blockHandler-sentinel限流,无此流水: blockException  &quot;</span> + blockException.getMessage(), payment);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>⑤、结论<br><strong>blockHandler</strong> 主要是管限流配置的，只配置了他，代码出现问题他管不着会返回错误页面，但是触发到限流条件了的话他会进行接管。<br><strong>fallback</strong> 主要管代码出现异常，代码500出现错误了之后直接返回fallback的友好页面。<br>若 <strong>blockHandler 和 fallback 都进行了配置</strong>，则被限流降级而抛出 BlockException 时只会进入 blockHandler 处理逻辑。</p>
<h2 id="6-2、Feign系列"><a href="#6-2、Feign系列" class="headerlink" title="6.2、Feign系列"></a>6.2、Feign系列</h2><p>1、添加依赖</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">&lt;!--SpringCloud openfeign --&gt;</span><br><span class="line">        &lt;dependency&gt;</span><br><span class="line">            &lt;groupId&gt;org.springframework.cloud&lt;&#x2F;groupId&gt;</span><br><span class="line">            &lt;artifactId&gt;spring-cloud-starter-openfeign&lt;&#x2F;artifactId&gt;</span><br><span class="line">        &lt;&#x2F;dependency&gt;</span><br></pre></td></tr></table></figure>
<p>2、修改上一个微服务的Yaml配置文件开启Sentinel对Feign的支持</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"># 激活Sentinel对Feign的支持</span><br><span class="line">feign:</span><br><span class="line">  sentinel:</span><br><span class="line">    enabled: true </span><br></pre></td></tr></table></figure>
<p>3、带@FeignClient注解的业务接口</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">@FeignClient(value = <span class="string">&quot;nacos-payment-provider&quot;</span>, fallback = PaymentServiceImpl.class)</span><br><span class="line">public interface PaymentService &#123;</span><br><span class="line">    @GetMapping(value = <span class="string">&quot;/paymentSQL/&#123;id&#125;&quot;</span>)</span><br><span class="line">    public CommonResult&lt;Payment&gt; paymentSQL(@PathVariable(<span class="string">&quot;id&quot;</span>) Long id);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>4、全局业务降级接口实现类</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@Component</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">PaymentServiceImpl</span> <span class="title">implements</span> <span class="title">PaymentService</span> </span>&#123;</span><br><span class="line">    @Override</span><br><span class="line">    public CommonResult&lt;Payment&gt; <span class="function"><span class="title">paymentSQL</span>(<span class="params">Long id</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult&lt;&gt;(<span class="number">444</span>, <span class="string">&quot;服务降级返回，没有该流水信息&quot;</span>, <span class="keyword">new</span> Payment(id, <span class="string">&quot;errorSerial......&quot;</span>));</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>5、Controller控制层</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">@Resource</span><br><span class="line">    private PaymentService paymentService;</span><br><span class="line"></span><br><span class="line">    @GetMapping(value = <span class="string">&quot;/consumer/openfeign/&#123;id&#125;&quot;</span>)</span><br><span class="line">    public CommonResult&lt;Payment&gt; <span class="function"><span class="title">paymentSQL</span>(<span class="params">@PathVariable(<span class="string">&quot;id&quot;</span>) Long id</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">if</span> (id == <span class="number">4</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> RuntimeException(<span class="string">&quot;没有该id&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> paymentService.paymentSQL(id);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>6、主启动类</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">@EnableDiscoveryClient</span><br><span class="line">@SpringBootApplication</span><br><span class="line">@EnableFeignClients</span><br><span class="line">public <span class="class"><span class="keyword">class</span> <span class="title">OrderNacosMain84</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    public <span class="keyword">static</span> <span class="keyword">void</span> <span class="function"><span class="title">main</span>(<span class="params"><span class="built_in">String</span>[] args</span>)</span> &#123;</span><br><span class="line">            SpringApplication.run(OrderNacosMain84.class, args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>7、测试：测试84调用9003，此时故意关闭9003微服务提供者，看84消费侧自动降级，不会被耗死。<br>结论：发现自动跳转到实现@FeignClient注解的业务接口的实现类上去了，不会被耗死，所以也有全局保护的功能。</p>
<h2 id="6-3、熔断框架比较"><a href="#6-3、熔断框架比较" class="headerlink" title="6.3、熔断框架比较"></a>6.3、熔断框架比较</h2><p><img src="https://img-blog.csdnimg.cn/20210420155045333.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<h1 id="7、Sentinel规则持久化"><a href="#7、Sentinel规则持久化" class="headerlink" title="7、Sentinel规则持久化"></a>7、Sentinel规则持久化</h1><p><strong>发现一个问题</strong>：一旦我们重启应用，sentinel规则将消失，生产环境需要将配置规则进行持久化。所以我们需将限流配置规则持久化进Nacos保存，只要刷新8401某个rest地址，sentinel控制台的流控规则就能看到，只要Nacos里面的配置不删除，针对8401上sentinel上的流控规则持续有效。<br>1、修改8401的Pom文件（添加Sentinel整合Nacos的依赖）</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">&lt;!--SpringCloud ailibaba sentinel-datasource-nacos --&gt;</span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;com.alibaba.csp&lt;&#x2F;groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;sentinel-datasource-nacos&lt;&#x2F;artifactId&gt;</span><br><span class="line">&lt;&#x2F;dependency&gt;</span><br></pre></td></tr></table></figure>
<p>2、修改8401的Yaml配置文件</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">spring:</span><br><span class="line">  cloud:</span><br><span class="line">    sentinel:</span><br><span class="line">      transport:</span><br><span class="line">        dashboard: localhost:8080 #配置Sentinel dashboard地址</span><br><span class="line">        port: 8719</span><br><span class="line">      datasource:</span><br><span class="line">        datasource1:</span><br><span class="line">          nacos:</span><br><span class="line">            server-addr: localhost:8848</span><br><span class="line">            dataId: cloudalibaba-sentinel-service</span><br><span class="line">            groupId: DEFAULT_GROUP</span><br><span class="line">            data-type: json</span><br><span class="line">            rule-type: flow</span><br></pre></td></tr></table></figure>
<p>3、在Nacos中添加Sentinel的配置规则<br><img src="https://img-blog.csdnimg.cn/20210420155539696.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<p><img src="https://img-blog.csdnimg.cn/20210420155528360.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQ5Mzcx,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"><br>4、在Nacos中添加Sentinel的配置规则<br>启动8401端口之后，只要刷新一下Sentinel就可以看到规则已经出现在列表中了，快速访问<a target="_blank" rel="noopener" href="http://localhost:8401/rateLimit/byUrl%E5%8F%91%E7%8E%B0%E9%99%90%E6%B5%81%E8%A7%84%E5%88%99%E5%B7%B2%E7%BB%8F%E5%90%AF%E5%8A%A8%E4%BA%86%EF%BC%8C%E8%B6%85%E8%BF%87%E9%99%90%E6%B5%81%E8%A7%84%E5%88%99%E5%B0%B1%E4%BC%9A%E5%87%BA%E7%8E%B0%E9%BB%98%E8%AE%A4%E7%9A%84%E9%94%99%E8%AF%AF%E6%8F%90%E9%86%92%E3%80%82">http://localhost:8401/rateLimit/byUrl发现限流规则已经启动了，超过限流规则就会出现默认的错误提醒。</a><br>5、关闭8401服务之后规则消失，再次启动访问资源又回重新出现，达到持久化的目的。</p>
<h1 id="8、学习地址"><a href="#8、学习地址" class="headerlink" title="8、学习地址"></a>8、学习地址</h1><p>来源：哔哩哔哩尚硅谷：<a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV18E411x7eT">https://www.bilibili.com/video/BV18E411x7eT</a></p>

                
            </div>
            <hr/>

            

    <div class="reprint" id="reprint-statement">
        
            <div class="reprint__author">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-user">
                        文章作者:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="/about" rel="external nofollow noreferrer">Kevin</a>
                </span>
            </div>
            <div class="reprint__type">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-link">
                        文章链接:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="http://example.com/2021/04/30/SpringCloud%20Alibaba%20Sentinel%E7%86%94%E6%96%AD%E4%B8%8E%E9%99%90%E6%B5%81/">http://example.com/2021/04/30/SpringCloud%20Alibaba%20Sentinel%E7%86%94%E6%96%AD%E4%B8%8E%E9%99%90%E6%B5%81/</a>
                </span>
            </div>
            <div class="reprint__notice">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-copyright">
                        版权声明:
                    </i>
                </span>
                <span class="reprint-info">
                    本博客所有文章除特別声明外，均采用
                    <a href="https://creativecommons.org/licenses/by/4.0/deed.zh" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>
                    许可协议。转载请注明来源
                    <a href="/about" target="_blank">Kevin</a>
                    !
                </span>
            </div>
        
    </div>

    <script async defer>
      document.addEventListener("copy", function (e) {
        let toastHTML = '<span>复制成功，请遵循本文的转载规则</span><button class="btn-flat toast-action" onclick="navToReprintStatement()" style="font-size: smaller">查看</a>';
        M.toast({html: toastHTML})
      });

      function navToReprintStatement() {
        $("html, body").animate({scrollTop: $("#reprint-statement").offset().top - 80}, 800);
      }
    </script>



            <div class="tag_share" style="display: block;">
                <div class="post-meta__tag-list" style="display: inline-block;">
                    
                        <div class="article-tag">
                            <span class="chip bg-color">无标签</span>
                        </div>
                    
                </div>
                <div class="post_share" style="zoom: 80%; width: fit-content; display: inline-block; float: right; margin: -0.15rem 0;">
                    <link rel="stylesheet" type="text/css" href="/libs/share/css/share.min.css">
<div id="article-share">

    
    <div class="social-share" data-sites="twitter,facebook,google,qq,qzone,wechat,weibo,douban,linkedin" data-wechat-qrcode-helper="<p>微信扫一扫即可分享！</p>"></div>
    <script src="/libs/share/js/social-share.min.js"></script>
    

    

</div>

                </div>
            </div>
            
                <style>
    #reward {
        margin: 40px 0;
        text-align: center;
    }

    #reward .reward-link {
        font-size: 1.4rem;
        line-height: 38px;
    }

    #reward .btn-floating:hover {
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    #rewardModal {
        width: 320px;
        height: 350px;
    }

    #rewardModal .reward-title {
        margin: 15px auto;
        padding-bottom: 5px;
    }

    #rewardModal .modal-content {
        padding: 10px;
    }

    #rewardModal .close {
        position: absolute;
        right: 15px;
        top: 15px;
        color: rgba(0, 0, 0, 0.5);
        font-size: 1.3rem;
        line-height: 20px;
        cursor: pointer;
    }

    #rewardModal .close:hover {
        color: #ef5350;
        transform: scale(1.3);
        -moz-transform:scale(1.3);
        -webkit-transform:scale(1.3);
        -o-transform:scale(1.3);
    }

    #rewardModal .reward-tabs {
        margin: 0 auto;
        width: 210px;
    }

    .reward-tabs .tabs {
        height: 38px;
        margin: 10px auto;
        padding-left: 0;
    }

    .reward-content ul {
        padding-left: 0 !important;
    }

    .reward-tabs .tabs .tab {
        height: 38px;
        line-height: 38px;
    }

    .reward-tabs .tab a {
        color: #fff;
        background-color: #ccc;
    }

    .reward-tabs .tab a:hover {
        background-color: #ccc;
        color: #fff;
    }

    .reward-tabs .wechat-tab .active {
        color: #fff !important;
        background-color: #22AB38 !important;
    }

    .reward-tabs .alipay-tab .active {
        color: #fff !important;
        background-color: #019FE8 !important;
    }

    .reward-tabs .reward-img {
        width: 210px;
        height: 210px;
    }
</style>

<div id="reward">
    <a href="#rewardModal" class="reward-link modal-trigger btn-floating btn-medium waves-effect waves-light red">赏</a>

    <!-- Modal Structure -->
    <div id="rewardModal" class="modal">
        <div class="modal-content">
            <a class="close modal-close"><i class="fas fa-times"></i></a>
            <h4 class="reward-title">您的赏识是我前进的动力！</h4>
            <div class="reward-content">
                <div class="reward-tabs">
                    <ul class="tabs row">
                        <li class="tab col s6 alipay-tab waves-effect waves-light"><a href="#alipay">支付宝</a></li>
                        <li class="tab col s6 wechat-tab waves-effect waves-light"><a href="#wechat">微 信</a></li>
                    </ul>
                    <div id="alipay">
                        <img src="/medias/reward/alipay.jpg" class="reward-img" alt="支付宝打赏二维码">
                    </div>
                    <div id="wechat">
                        <img src="/medias/reward/wechat.png" class="reward-img" alt="微信打赏二维码">
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
    $(function () {
        $('.tabs').tabs();
    });
</script>

            
        </div>
    </div>

    

    

    

    

    

    

    

    

    

<article id="prenext-posts" class="prev-next articles">
    <div class="row article-row">
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge left-badge text-color">
                <i class="fas fa-chevron-left"></i>&nbsp;上一篇</div>
            <div class="card">
                <a href="/2021/04/30/SpringCloud%20Stream%E6%B6%88%E6%81%AF%E9%A9%B1%E5%8A%A8%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/22.jpg" class="responsive-img" alt="SpringCloud Stream消息驱动">
                        
                        <span class="card-title">SpringCloud Stream消息驱动</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            
                        
                    </div>
                    <div class="publish-info">
                        <span class="publish-date">
                            <i class="far fa-clock fa-fw icon-date"></i>2021-04-30
                        </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-user fa-fw"></i>
                            Kevin
                            
                        </span>
                    </div>
                </div>
                
            </div>
        </div>
        
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge right-badge text-color">
                下一篇&nbsp;<i class="fas fa-chevron-right"></i>
            </div>
            <div class="card">
                <a href="/2021/04/30/Eureka%E4%B8%8EOpenFeign/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/6.jpg" class="responsive-img" alt="Eureka与OpenFeign">
                        
                        <span class="card-title">Eureka与OpenFeign</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            
                        
                    </div>
                    <div class="publish-info">
                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2021-04-30
                            </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-user fa-fw"></i>
                            Kevin
                            
                        </span>
                    </div>
                </div>
                
            </div>
        </div>
        
    </div>
</article>

</div>



<!-- 代码块功能依赖 -->
<script type="text/javascript" src="/libs/codeBlock/codeBlockFuction.js"></script>

<!-- 代码语言 -->

<script type="text/javascript" src="/libs/codeBlock/codeLang.js"></script>


<!-- 代码块复制 -->

<script type="text/javascript" src="/libs/codeBlock/codeCopy.js"></script>


<!-- 代码块收缩 -->

<script type="text/javascript" src="/libs/codeBlock/codeShrink.js"></script>


    </div>
    <div id="toc-aside" class="expanded col l3 hide-on-med-and-down">
        <div class="toc-widget card" style="background-color: white;">
            <div class="toc-title"><i class="far fa-list-alt"></i>&nbsp;&nbsp;目录</div>
            <div id="toc-content"></div>
        </div>
    </div>
</div>

<!-- TOC 悬浮按钮. -->

<div id="floating-toc-btn" class="hide-on-med-and-down">
    <a class="btn-floating btn-large bg-color">
        <i class="fas fa-list-ul"></i>
    </a>
</div>


<script src="/libs/tocbot/tocbot.min.js"></script>
<script>
    $(function () {
        tocbot.init({
            tocSelector: '#toc-content',
            contentSelector: '#articleContent',
            headingsOffset: -($(window).height() * 0.4 - 45),
            collapseDepth: Number('0'),
            headingSelector: 'h2, h3, h4'
        });

        // modify the toc link href to support Chinese.
        let i = 0;
        let tocHeading = 'toc-heading-';
        $('#toc-content a').each(function () {
            $(this).attr('href', '#' + tocHeading + (++i));
        });

        // modify the heading title id to support Chinese.
        i = 0;
        $('#articleContent').children('h2, h3, h4').each(function () {
            $(this).attr('id', tocHeading + (++i));
        });

        // Set scroll toc fixed.
        let tocHeight = parseInt($(window).height() * 0.4 - 64);
        let $tocWidget = $('.toc-widget');
        $(window).scroll(function () {
            let scroll = $(window).scrollTop();
            /* add post toc fixed. */
            if (scroll > tocHeight) {
                $tocWidget.addClass('toc-fixed');
            } else {
                $tocWidget.removeClass('toc-fixed');
            }
        });

        
        /* 修复文章卡片 div 的宽度. */
        let fixPostCardWidth = function (srcId, targetId) {
            let srcDiv = $('#' + srcId);
            if (srcDiv.length === 0) {
                return;
            }

            let w = srcDiv.width();
            if (w >= 450) {
                w = w + 21;
            } else if (w >= 350 && w < 450) {
                w = w + 18;
            } else if (w >= 300 && w < 350) {
                w = w + 16;
            } else {
                w = w + 14;
            }
            $('#' + targetId).width(w);
        };

        // 切换TOC目录展开收缩的相关操作.
        const expandedClass = 'expanded';
        let $tocAside = $('#toc-aside');
        let $mainContent = $('#main-content');
        $('#floating-toc-btn .btn-floating').click(function () {
            if ($tocAside.hasClass(expandedClass)) {
                $tocAside.removeClass(expandedClass).hide();
                $mainContent.removeClass('l9');
            } else {
                $tocAside.addClass(expandedClass).show();
                $mainContent.addClass('l9');
            }
            fixPostCardWidth('artDetail', 'prenext-posts');
        });
        
    });
</script>

    

</main>




    <footer class="page-footer bg-color">
    
        <link rel="stylesheet" href="/libs/aplayer/APlayer.min.css">
<style>
    .aplayer .aplayer-lrc p {
        
        display: none;
        
        font-size: 12px;
        font-weight: 700;
        line-height: 16px !important;
    }

    .aplayer .aplayer-lrc p.aplayer-lrc-current {
        
        display: none;
        
        font-size: 15px;
        color: #42b983;
    }

    
    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body {
        left: -66px !important;
    }

    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body:hover {
        left: 0px !important;
    }

    
</style>
<div class="">
    
    <div class="row">
        <meting-js class="col l8 offset-l2 m10 offset-m1 s12"
                   server="netease"
                   type="playlist"
                   id="2039019608"
                   fixed='true'
                   autoplay='false'
                   theme='#42b983'
                   loop='all'
                   order='random'
                   preload='auto'
                   volume='0.7'
                   list-folded='true'
        >
        </meting-js>
    </div>
</div>

<script src="/libs/aplayer/APlayer.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/meting@2/dist/Meting.min.js"></script>

    
    <div class="container row center-align" style="margin-bottom: 15px !important;">
        <div class="col s12 m8 l8 copy-right">
            Copyright&nbsp;&copy;
            
                <span id="year">2021</span>
            
            <span id="year">2021</span>
            <a href="/about" target="_blank">Kevin</a>
            |&nbsp;Powered by&nbsp;<a href="https://hexo.io/" target="_blank">Hexo</a>
            |&nbsp;Theme&nbsp;<a href="https://github.com/blinkfox/hexo-theme-matery" target="_blank">Matery</a>
            <br>
            
            
            
            
            
            
            <span id="busuanzi_container_site_pv">
                |&nbsp;<i class="far fa-eye"></i>&nbsp;总访问量:&nbsp;<span id="busuanzi_value_site_pv"
                    class="white-color"></span>&nbsp;次
            </span>
            
            
            <span id="busuanzi_container_site_uv">
                |&nbsp;<i class="fas fa-users"></i>&nbsp;总访问人数:&nbsp;<span id="busuanzi_value_site_uv"
                    class="white-color"></span>&nbsp;人
            </span>
            
            <br>
            
            <span id="sitetime">载入运行时间...</span>
            <script>
                function siteTime() {
                    var seconds = 1000;
                    var minutes = seconds * 60;
                    var hours = minutes * 60;
                    var days = hours * 24;
                    var years = days * 365;
                    var today = new Date();
                    var startYear = "2021";
                    var startMonth = "3";
                    var startDate = "29";
                    var startHour = "0";
                    var startMinute = "0";
                    var startSecond = "0";
                    var todayYear = today.getFullYear();
                    var todayMonth = today.getMonth() + 1;
                    var todayDate = today.getDate();
                    var todayHour = today.getHours();
                    var todayMinute = today.getMinutes();
                    var todaySecond = today.getSeconds();
                    var t1 = Date.UTC(startYear, startMonth, startDate, startHour, startMinute, startSecond);
                    var t2 = Date.UTC(todayYear, todayMonth, todayDate, todayHour, todayMinute, todaySecond);
                    var diff = t2 - t1;
                    var diffYears = Math.floor(diff / years);
                    var diffDays = Math.floor((diff / days) - diffYears * 365);
                    var diffHours = Math.floor((diff - (diffYears * 365 + diffDays) * days) / hours);
                    var diffMinutes = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours) /
                        minutes);
                    var diffSeconds = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours -
                        diffMinutes * minutes) / seconds);
                    if (startYear == todayYear) {
                        document.getElementById("year").innerHTML = todayYear;
                        document.getElementById("sitetime").innerHTML = "本站已安全运行 " + diffDays + " 天 " + diffHours +
                            " 小时 " + diffMinutes + " 分钟 " + diffSeconds + " 秒";
                    } else {
                        document.getElementById("year").innerHTML = startYear + " - " + todayYear;
                        document.getElementById("sitetime").innerHTML = "本站已安全运行 " + diffYears + " 年 " + diffDays +
                            " 天 " + diffHours + " 小时 " + diffMinutes + " 分钟 " + diffSeconds + " 秒";
                    }
                }
                setInterval(siteTime, 1000);
            </script>
            
            <br>
            
        </div>
        <div class="col s12 m4 l4 social-link social-statis">
    <a href="https://github.com/ZKQevin" class="tooltipped" target="_blank" data-tooltip="访问我的GitHub" data-position="top" data-delay="50">
        <i class="fab fa-github"></i>
    </a>



    <a href="mailto:773116395@qq.com" class="tooltipped" target="_blank" data-tooltip="邮件联系我" data-position="top" data-delay="50">
        <i class="fas fa-envelope-open"></i>
    </a>







    <a href="tencent://AddContact/?fromId=50&fromSubId=1&subcmd=all&uin=773116395" class="tooltipped" target="_blank" data-tooltip="QQ联系我: 773116395" data-position="top" data-delay="50">
        <i class="fab fa-qq"></i>
    </a>







</div>
    </div>
</footer>

<div class="progress-bar"></div>


    <!-- 搜索遮罩框 -->
<div id="searchModal" class="modal">
    <div class="modal-content">
        <div class="search-header">
            <span class="title"><i class="fas fa-search"></i>&nbsp;&nbsp;搜索</span>
            <input type="search" id="searchInput" name="s" placeholder="请输入搜索的关键字"
                   class="search-input">
        </div>
        <div id="searchResult"></div>
    </div>
</div>

<script type="text/javascript">
$(function () {
    var searchFunc = function (path, search_id, content_id) {
        'use strict';
        $.ajax({
            url: path,
            dataType: "xml",
            success: function (xmlResponse) {
                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
                $input.addEventListener('input', function () {
                    var str = '<ul class=\"search-result-list\">';
                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
                    // perform local searching
                    datas.forEach(function (data) {
                        var isMatch = true;
                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
</script>

    <!-- 回到顶部按钮 -->
<div id="backTop" class="top-scroll">
    <a class="btn-floating btn-large waves-effect waves-light" href="#!">
        <i class="fas fa-arrow-up"></i>
    </a>
</div>


    <script src="/libs/materialize/materialize.min.js"></script>
    <script src="/libs/masonry/masonry.pkgd.min.js"></script>
    <script src="/libs/aos/aos.js"></script>
    <script src="/libs/scrollprogress/scrollProgress.min.js"></script>
    <script src="/libs/lightGallery/js/lightgallery-all.min.js"></script>
    <script src="/js/matery.js"></script>

    <!-- Baidu Analytics -->

    <!-- Baidu Push -->

<script>
    (function () {
        var bp = document.createElement('script');
        var curProtocol = window.location.protocol.split(':')[0];
        if (curProtocol === 'https') {
            bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
        } else {
            bp.src = 'http://push.zhanzhang.baidu.com/push.js';
        }
        var s = document.getElementsByTagName("script")[0];
        s.parentNode.insertBefore(bp, s);
    })();
</script>

    
    <script src="/libs/others/clicklove.js" async="async"></script>
    
    
    <script async src="/libs/others/busuanzi.pure.mini.js"></script>
    

    

    

    <!--腾讯兔小巢-->
    
    

    

    

    
    <script src="/libs/instantpage/instantpage.js" type="module"></script>
    

	<script src="https://cdn.jsdelivr.net/gh/Mculover666/live2d-widget/autoload.js"></script>
</body>

</html>
